CN108316981B - Natural gas residual pressure and gas turbine coupling and supplying system, pipe network system and method - Google Patents
Natural gas residual pressure and gas turbine coupling and supplying system, pipe network system and method Download PDFInfo
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- CN108316981B CN108316981B CN201810210008.9A CN201810210008A CN108316981B CN 108316981 B CN108316981 B CN 108316981B CN 201810210008 A CN201810210008 A CN 201810210008A CN 108316981 B CN108316981 B CN 108316981B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 242
- 239000003345 natural gas Substances 0.000 title claims abstract description 121
- 239000007789 gas Substances 0.000 title claims abstract description 97
- 230000008878 coupling Effects 0.000 title claims abstract description 31
- 238000010168 coupling process Methods 0.000 title claims abstract description 31
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000002918 waste heat Substances 0.000 claims abstract description 36
- 238000010248 power generation Methods 0.000 claims abstract description 28
- 238000010521 absorption reaction Methods 0.000 claims abstract description 27
- 238000005057 refrigeration Methods 0.000 claims abstract description 25
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003546 flue gas Substances 0.000 claims abstract description 18
- 238000004146 energy storage Methods 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 abstract description 29
- 239000000126 substance Substances 0.000 abstract description 2
- 230000010354 integration Effects 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 4
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 230000007363 regulatory process Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/06—Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
- F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/22—Fuel supply systems
- F02C7/224—Heating fuel before feeding to the burner
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to the field of energy utilization, and discloses a natural gas residual pressure and gas turbine coupling and supplying system, a pipe network system and a method, wherein the system comprises the following steps: five subsystems of natural gas residual pressure power generation, cold energy utilization, gas turbine power generation, flue gas waste heat utilization and natural gas preheating, include: the system comprises an expansion machine, a first generator, a refrigeration heat exchanger, a gas turbine, a second generator and a waste heat absorption type utilization device, wherein the expansion machine is connected with the first generator; the refrigeration heat exchanger is connected with the outlet end of the natural gas residual pressure power generation subsystem; the second generator is connected with a second regulating valve through a gas turbine; the waste heat absorption type utilization device is connected with the outlet end of the gas turbine power generation subsystem. The invention combines the pressure energy and chemical energy utilization of high-pressure natural gas, optimizes the system integration, externally generates electric energy, cold energy and heat energy, outputs low-pressure natural gas, realizes the cascade utilization of energy sources, enhances the energy supply stability, greatly improves the comprehensive efficiency of the system, and has great significance in popularization and application of distributed energy sources.
Description
Technical Field
The invention relates to the field of energy utilization, in particular to a natural gas residual pressure and gas turbine coupling and supplying system, a pipe network system and a method.
Background
At present, the long-distance natural gas in China is mostly transported by a high-pressure pipeline, the pressure is above 10MPa, the transported high-pressure natural gas is reduced to a medium-pressure standard by a pressure regulating station and enters a city gas pipeline network, and the pressure is reduced to a low pressure by means of a pressure regulating station box for users to use. The natural gas releases a large amount of pressure energy in the pressure regulating process, and meanwhile, the temperature is rapidly reduced, so that a large amount of cold energy is generated. At present, the partial pressure difference can not be collected and applied by related processes, so that the great waste of resources is caused, and meanwhile, the rapid cooling threatens the safe operation of the pressure regulating equipment.
The traditional natural gas turbine distributed energy system has the defects of unbalanced cold and hot loads, narrow range of unit operation conditions, low efficiency and the like. In practical application, the natural gas is designed and operated according to modes such as 'electricity by heat determination' or 'electricity by heat determination', and the like, and the comprehensive utilization efficiency and energy supply stability of the natural gas are low, so that the large-scale application of the natural gas is limited. Therefore, how to utilize new strategies and ideas to improve the comprehensive utilization efficiency of natural gas and the energy supply stability is a problem to be solved urgently at present.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to provide a natural gas excess pressure and gas turbine coupling combined supply system, a pipe network system and a method, which solve the problems that in the prior art, a great amount of pressure energy released by natural gas in the pressure regulating process cannot be recovered, so that resources are wasted greatly, meanwhile, the temperature is reduced rapidly, a great amount of cold energy is generated, and the safety operation of pressure regulating equipment is threatened; on the other hand, the problems of unbalanced cold-heat-electricity load and low comprehensive energy utilization efficiency of a traditional gas turbine distributed energy system are effectively solved.
(II) technical scheme
In order to solve the technical problems, the invention provides a natural gas residual pressure and gas turbine coupling and supplying system, which is characterized by comprising the following components: the system comprises a natural gas residual pressure power generation subsystem, a cold energy utilization subsystem, a gas turbine power generation subsystem, a flue gas waste heat utilization subsystem and a natural gas preheating subsystem; wherein,
The natural gas residual pressure power generation subsystem comprises an expander and a first power generator, and the expander is connected with the first power generator;
the cold energy utilization subsystem comprises a refrigeration heat exchanger which is connected with the expander;
the gas turbine power generation subsystem comprises a gas turbine and a second power generator, and the gas turbine is connected with the second power generator;
the flue gas waste heat utilization subsystem comprises a waste heat absorption type utilization device, and an inlet of the waste heat absorption type utilization device is connected with an outlet end of the gas turbine;
The natural gas preheating subsystem comprises a preheating heat exchanger and an electric heater, the electric heater is connected to the inlet of the gas turbine and is used for heating natural gas which is introduced into the gas turbine or a low-pressure pipe network of the next stage, one heat exchange pipeline of the preheating heat exchanger is connected between the refrigeration heat exchanger and the electric heater, and the other heat exchange pipeline of the preheating heat exchanger is connected with the outlet of the waste heat absorption type utilization device.
The natural gas residual pressure power generation subsystem further comprises a first filter, and the first filter is connected with an inlet of the expander.
The natural gas residual pressure power generation subsystem further comprises a first regulating valve, and the first regulating valve is connected between the first filter and the inlet of the expander.
The gas turbine power generation subsystem further comprises a second regulating valve, and the electric heater is connected to the inlet of the gas turbine through the second regulating valve.
The system further comprises a first energy storage tank and a second energy storage tank, wherein the first energy storage tank is connected with the refrigeration heat exchanger, and the second energy storage tank is connected with the waste heat absorption type utilization device.
The refrigerating heat exchanger is connected with the outlet end of the expansion machine, and the waste heat absorption type utilization device is connected with the outlet end of the gas turbine.
Wherein, its characterized in that, the expander is turbine expander or screw expander.
The invention discloses a natural gas residual pressure and gas turbine coupling joint supply pipe network system, which also comprises a bypass pipe network system, wherein the bypass pipe network system comprises a cut-off valve, a second filter, a first pressure regulating valve, a second pressure regulating valve, an emergency cut-off valve and a cut-off valve, and the natural gas residual pressure and gas turbine coupling joint supply system of the invention, wherein the cut-off valve, the second filter, the first pressure regulating valve and the second pressure regulating valve are sequentially connected, one end of the emergency cut-off valve is connected between the second filter and the first pressure regulating valve, the other end of the emergency cut-off valve is connected with the natural gas residual pressure and gas turbine coupling joint supply system, and the cut-off valve is connected between a downstream natural gas pipe network and the natural gas residual pressure and gas turbine coupling joint supply system.
The invention also discloses a natural gas residual pressure and gas turbine coupling co-supply method, and the working method of the natural gas residual pressure and gas turbine coupling co-supply system comprises the following steps:
s1, expanding natural gas to do work through an expander to drive a first generator to generate electric energy;
s2, the natural gas after expansion enters a refrigeration heat exchanger, exchanges cold energy, is supplied to a user for use, and is heated by a preheating heat exchanger and an electric heater;
s3, introducing a part of the heated natural gas into a gas turbine, and burning to apply work to drive a second generator to generate electric energy; the other part enters a downstream natural gas pipe network system;
And S4, introducing the burnt natural gas into a flue gas waste heat absorption type utilization device for waste heat utilization.
(III) beneficial effects
According to the natural gas residual pressure and gas turbine coupling joint supply system, the pipe network system and the method, provided by the invention, the expansion machine and the first generator utilize natural gas differential pressure energy to generate power and generate cold energy, the gas turbine and the second generator utilize natural gas chemical energy to generate power, and the flue gas residual heat is utilized to generate cold energy and heat energy, and the natural gas at the outlet of the refrigeration heat exchanger is preheated. The system integrates and optimizes, supplements each other, externally generates electric energy, cold energy and heat energy, outputs low-pressure natural gas, realizes energy cascade utilization, enhances energy supply stability, greatly improves equipment utilization rate and system comprehensive efficiency, and has great significance for popularization and application of distributed energy sources.
Drawings
FIG. 1 is a schematic diagram of a natural gas excess pressure and gas turbine coupled co-generation system according to the present invention;
FIG. 2 is a schematic diagram of a natural gas excess pressure and gas turbine coupled piping network system according to the present invention.
In the figure, 1, a shut-off valve; 2. a second filter; 3. a first pressure regulating valve; 4. a second pressure regulating valve; 5. an emergency shut-off valve; 6. the natural gas residual pressure and the gas turbine are coupled to form a combined supply system; 7. a stop valve; 601. a first filter; 602. a first regulating valve; 603. a first generator; 604. an expander; 605. a first energy storage tank; 606. a refrigeration heat exchanger; 607. preheating a heat exchanger; 608. a gas turbine; 609. an electric heater; 610. a second generator; 611. a second energy storage tank; 612. a waste heat absorption type utilization device; 613. and a second regulating valve.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, the invention discloses a natural gas excess pressure and gas turbine coupling and supplying system, which comprises: the system comprises a natural gas residual pressure power generation subsystem, a cold energy utilization subsystem, a gas turbine power generation subsystem, a flue gas waste heat utilization subsystem and a natural gas preheating subsystem; wherein,
The natural gas residual pressure power generation subsystem comprises an expander 604 and a first generator 603, and the expander 604 is connected with the first generator 603;
the cold energy utilization subsystem comprises a refrigeration heat exchanger 606, and the refrigeration heat exchanger 606 is connected with the expander 604;
the gas turbine power generation subsystem includes a gas turbine 608 and a second generator 610, the gas turbine 608 and the second generator 610 being connected;
the flue gas waste heat utilization subsystem comprises a waste heat absorption type utilization device 612, wherein an inlet of the waste heat absorption type utilization device 612 is connected with an outlet end of the gas turbine 608;
the natural gas preheating subsystem comprises a preheating heat exchanger 607 and an electric heater 609, the electric heater 609 is connected to the inlet of the gas turbine 608 and is used for heating natural gas which is introduced into the gas turbine 608 or a low-pressure pipe network of the next stage, one heat exchange pipeline of the preheating heat exchanger 607 is connected between the refrigeration heat exchanger 606 and the electric heater 609, and the other heat exchange pipeline of the preheating heat exchanger 607 is connected with the outlet of the waste heat absorption utilization device 612.
Specifically, the high-pressure natural gas is conveyed to the natural gas residual pressure power generation subsystem by using a pipeline, the expander 604 is expanded and depressurized by using the high-pressure natural gas, mechanical work is output outwards, the temperature of the high-pressure gas is rapidly reduced, and the first generator 603 generates power by using mechanical energy. The natural gas passing through the expander 604 is in a low-temperature specific pressure state, enters the refrigeration heat exchanger 606, exchanges heat with the refrigeration working medium, and exchanges cold energy for a user. After the temperature of the natural gas is increased by the preheating subsystem, part of the natural gas enters the gas turbine power generation subsystem through the second regulating valve 613, the natural gas generates power through combustion work, and part of the natural gas enters the next-stage low-pressure pipe network system through the stop valve 7. The hot flue gas generated by combustion of the gas turbine is led into a flue gas waste heat utilization subsystem, and cold energy or heat energy can be output according to different requirements. For example, the lithium bromide absorption type unit utilizing the flue gas waste heat can output heat energy outwards, and the heat absorption type refrigeration can also be utilized, so that the lithium bromide absorption type unit is a common refrigeration air conditioner unit. The cooling/heating operation mode can be adjusted according to seasons. The gas turbine 608 may be selected from heavy duty, light duty and micro gas turbines based on customer cooling, heating and electrical needs. The gas turbine 608 drives a second generator 610 to generate electricity. The inlet of the expander 604 is also provided with a first regulating valve 602 for regulating natural gas flow according to external energy demand, and regulating and controlling natural gas pressure according to the inlet condition of the expander 604. Further, the inlet of the gas turbine 608 is also provided with a second regulating valve 613, and the electric heater 609 is connected to the inlet of the gas turbine 608 through the second regulating valve 613, controls the inlet flow and pressure, and plays a role in cutting off the natural gas at the inlet of the gas turbine. The gas turbine 608 is also provided with an air inlet. Furthermore, the natural gas residual pressure and gas turbine coupling combined supply system can share the power generation grid-connected complete device, so that the cost is saved. The natural gas preheating subsystem can be used for heating low-temperature natural gas by using the generated hot flue gas, and then the hot flue gas is introduced into the gas turbine 608 for combustion or enters a next-stage low-pressure pipe network system, so that the cascade utilization of the hot flue gas is increased, and the system efficiency is improved. Preferably, a temperature sensor is also arranged at the inlet of the gas turbine 608, the temperature at the inlet is monitored in real time, and the electric heater 609 is controlled to be started and stopped according to the temperature.
The natural gas residual pressure power generation subsystem further comprises a first filter 601, and the first filter 601 is connected with an inlet of the expander 604. The method is used for filtering sundries in the natural gas, and the problems of damage to system components and low combustion efficiency are avoided.
The system further comprises a first energy storage tank 605 and a second energy storage tank 611, wherein the first energy storage tank 605 is connected with the refrigeration heat exchanger 606, and the second energy storage tank 611 is connected with the waste heat absorption type utilization device 612. According to the output cold energy or heat energy, the first energy storage tank 605 is a cold storage tank and a heat storage tank respectively; the second energy storage tank 611 is a cold storage tank or a heat storage tank, as required. And outputting timely according to the needs of users, and realizing peak clipping and valley filling of energy consumption.
Wherein the refrigeration heat exchanger 606 is connected to an outlet of the expander 604, and the waste heat absorption device 612 is connected to an outlet of the gas turbine 608. The refrigeration heat exchanger 606 of the embodiment is connected with the expander 604 of the natural gas residual pressure power generation subsystem, namely the expander 604 is provided with two outlet ends, one is connected with the first generator 603 for generating power, and the other is connected with the refrigeration heat exchanger 606 for providing cold energy; the waste heat absorption type utilization device 612 is connected with the gas turbine 608 of the gas turbine power generation subsystem, namely, the gas turbine 608 is provided with two outlet ends, one outlet end is connected with the second generator 610, the combustion work is performed to generate mechanical energy, the second generator 610 is utilized to generate power, and the other outlet end is connected with the waste heat absorption type utilization device 612, and the generated hot flue gas has internal energy and provides heat energy or cold energy.
The expander 604 may be a turbo expander or a screw expander, depending on the flow pressure range.
As shown in fig. 2, the invention further discloses a natural gas residual pressure and gas turbine coupling combined supply pipe network system, which comprises a bypass access pipe network system, wherein the bypass pipe network system comprises a cut-off valve 1, a second filter 2, a first pressure regulating valve 3, a second pressure regulating valve 4, an emergency cut-off valve 5, a cut-off valve 7 and the natural gas residual pressure and gas turbine coupling combined supply system 6, the cut-off valve 1, the second filter 2, the first pressure regulating valve 3 and the second pressure regulating valve 4 are sequentially connected, one end of the emergency cut-off valve 5 is connected between the second filter 2 and the first pressure regulating valve 3, the other end of the emergency cut-off valve 5 is connected with the natural gas residual pressure and gas turbine coupling combined supply system 6, and the cut-off valve 7 is connected between a downstream natural gas pipe network and the natural gas residual pressure and gas turbine coupling combined supply system 6.
Specifically, by adding the coupling combined supply system of the natural gas residual pressure and the gas turbine in the form of shunt connection of the natural gas high-pressure conveying pipe network, the emergency cut-off valve 5 can be utilized to open and close, the gas source is cut off in an emergency way, and the influence on the original pipeline conveying system is reduced to the greatest extent.
The stop valve 7 plays a role in protecting and cutting off, and prevents natural gas in the low-pressure pipe network system from entering the natural gas residual pressure and gas turbine coupling co-supply system 6 when the natural gas residual pressure and gas turbine coupling co-supply system does not operate.
The invention also discloses a natural gas residual pressure and gas turbine coupling co-supply method, and the working method of the natural gas residual pressure and gas turbine coupling co-supply system comprises the following steps:
s1, expanding natural gas to do work through an expander to drive a first generator to generate electric energy;
s2, the natural gas after expansion enters a refrigeration heat exchanger, exchanges cold energy, is supplied to a user for use, and is heated by a preheating heat exchanger and an electric heater;
s3, introducing a part of the heated natural gas into a gas turbine, and burning to apply work to drive a second generator to generate electric energy; the other part enters a downstream natural gas pipe network system;
and S4, introducing the combusted natural gas into a waste heat absorption type utilization device to utilize waste heat.
Specifically, natural gas expands to do work to generate mechanical energy to drive a first generator to generate electricity; the generated cold energy exchanges heat with the refrigerating medium, and the cold energy is stored in a cold storage tank for users to use; s2, after the low-temperature natural gas in the step S2 is preheated, part of the low-temperature natural gas enters a gas turbine, burns to do work, drives a second generator to generate power, and the rest part of the low-temperature natural gas enters a downstream natural gas pipe network system; the hot flue gas generated by combustion is utilized by a waste heat absorption type utilization device to generate heat energy or cold energy.
The invention discloses a natural gas residual pressure and gas turbine coupling joint supply system, a pipe network system and a method. The system integrates and optimizes energy supply, supplements each other, externally generates electric energy, cold energy and heat energy, outputs low-pressure natural gas, realizes energy cascade utilization, enhances energy supply stability, ensures that the comprehensive energy utilization efficiency reaches more than 70%, is an important mode for high-efficiency utilization of natural gas, has obvious economic benefit, and has great significance for popularization and application of distributed energy.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (9)
1. A natural gas excess pressure and gas turbine coupled co-generation system, comprising: the system comprises a natural gas residual pressure power generation subsystem, a cold energy utilization subsystem, a gas turbine power generation subsystem, a flue gas waste heat utilization subsystem and a natural gas preheating subsystem; wherein,
The natural gas residual pressure power generation subsystem comprises an expander (604) and a first generator (603), and the expander (604) is connected with the first generator (603);
The cold energy utilization subsystem comprises a refrigeration heat exchanger (606), wherein the refrigeration heat exchanger (606) is connected with the expander (604);
the gas turbine power generation subsystem includes a gas turbine (608) and a second generator (610), the gas turbine (608) and the second generator (610) being connected;
The flue gas waste heat utilization subsystem comprises a waste heat absorption type utilization device (612), wherein an inlet of the waste heat absorption type utilization device (612) is connected with an outlet end of the gas turbine (608);
The natural gas preheating subsystem comprises a preheating heat exchanger (607) and an electric heater (609), wherein the electric heater (609) is connected to an inlet of a gas turbine (608) and is used for heating natural gas which is introduced into the gas turbine (608) or a low-pressure pipe network of the next stage, one heat exchange pipeline of the preheating heat exchanger (607) is connected between the refrigerating heat exchanger (606) and the electric heater (609), and the other heat exchange pipeline of the preheating heat exchanger (607) is connected with an outlet of the waste heat absorption type utilization device (612).
2. The natural gas residual pressure and gas turbine coupled co-feed system of claim 1, wherein the natural gas residual pressure power generation subsystem further comprises a first filter (601), the first filter (601) being connected to an inlet of the expander (604).
3. The natural gas residual pressure and gas turbine coupled co-feed system of claim 2, wherein the natural gas residual pressure power generation subsystem further comprises a first regulator valve (602), the first regulator valve (602) being connected between the first filter (601) and an inlet of the expander (604).
4. The natural gas excess pressure and gas turbine coupled cogeneration system of claim 1, wherein said gas turbine power generation subsystem further comprises a second regulator valve (613), said electric heater (609) being connected to an inlet of a gas turbine (608) through said second regulator valve (613).
5. The natural gas excess pressure and gas turbine coupled cogeneration system of claim 1, further comprising a first energy storage tank (605) and a second energy storage tank (611), said first energy storage tank (605) being connected to said refrigeration heat exchanger (606), said second energy storage tank (611) being connected to said waste heat absorption utilization device (612).
6. The natural gas excess pressure and gas turbine coupled cogeneration system of claim 1, wherein said refrigeration heat exchanger (606) is connected to an outlet end of said expander (604), and said waste heat absorption utilization device (612) is connected to an outlet end of said gas turbine (608).
7. The natural gas excess pressure and gas turbine coupled supply system of any one of claims 1-6, wherein the expander (604) is a turbine expander or a screw expander.
8. The natural gas residual pressure and gas turbine coupling allies oneself with supplies pipe network system, characterized by also includes bypass pipe network system, bypass pipe network system includes trip valve (1), second filter (2), first air-vent valve (3), second air-vent valve (4), urgent trip valve (5), stop valve (7) and according to any one of claims 1-7 natural gas residual pressure and gas turbine coupling allies oneself with supply system (6), trip valve (1), second filter (2), first air-vent valve (3) and second air-vent valve (4) are connected in proper order, the one end of urgent trip valve (5) be connected in between second filter (2) and first air-vent valve (3), the other end of urgent trip valve (5) with natural gas residual pressure and gas turbine coupling allies oneself with supply system (6) are connected, stop valve (7) are connected in downstream natural gas pipe network with between natural gas residual pressure and the gas turbine coupling allies oneself with supply system (6).
9. A method for coupling natural gas excess pressure to a gas turbine, characterized in that the method for operating a natural gas excess pressure to gas turbine coupling system according to any one of claims 1 to 7 comprises:
s1, expanding natural gas to do work through an expander to drive a first generator to generate electric energy;
s2, the natural gas after expansion enters a refrigeration heat exchanger, exchanges cold energy, is supplied to a user for use, and is heated by a preheating heat exchanger and an electric heater;
s3, introducing a part of the heated natural gas into a gas turbine, and burning to apply work to drive a second generator to generate electric energy; the other part enters a downstream natural gas pipe network system;
And S4, introducing the burnt natural gas into a flue gas waste heat absorption type utilization device for waste heat utilization.
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| CN201810210008.9A CN108316981B (en) | 2018-03-14 | 2018-03-14 | Natural gas residual pressure and gas turbine coupling and supplying system, pipe network system and method |
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| CN201810210008.9A CN108316981B (en) | 2018-03-14 | 2018-03-14 | Natural gas residual pressure and gas turbine coupling and supplying system, pipe network system and method |
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| CN108316981B true CN108316981B (en) | 2024-05-03 |
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